How can I change the icon of my App in iOS 4 at run-time the way the icon of the Calendar app changes based on the date today?
I want to publish a 4 digit number nu
The best you can do right now within the bounds of Apple-sanctioned APIs is to add a red badge with a number to the icon using the UIApplication applicationIconBadgeNumber
property. Not sure if it's big enough to fit 4 digits though.
That's if you want to set it while the app is open. To update the badge in the background, you will need to either post a UILocalNotification
(if you know ahead of time when and what the badge should say), or use push notifications.
There is no way to do this using the iOS SDK (you can badge your icon, but you can't modify the icon itself.) If you would like to see this feature added to iOS, file an enhancement request at http://bugreporter.apple.com.